the Archbishop of Canterbury is the senior bishop and principal leader of the Church of England. The rules regarding marriage for clergy, including bishops, within the Church of England have evolved over time.
Historically, priests in the Anglican Church were not allowed to marry, and they were expected to remain celibate. However, this changed during the Reformation in the 16th century when the Church of England broke away from the authority of the Pope and the Roman Catholic Church. Under the reign of King Henry VIII, the rules regarding clerical celibacy were relaxed, and Anglican priests were permitted to marry.
Since then, marriage has been allowed for Anglican clergy, including bishops. This means that the Archbishop of Canterbury, being a bishop within the Church of England, is permitted to marry.
It's worth noting that different branches of Christianity and denominations have different rules and traditions regarding clerical marriage. In some other Christian traditions, such as the Roman Catholic Church, priests are still expected to remain celibate, while in others, such as many Protestant denominations, marriage is generally accepted for clergy.